Final answer:
Both calcium channel blockers and opioids can interfere with gastric motility by either relaxing the gastrointestinal smooth muscle or acting on the enteric nervous system, leading to reduced movement and potential constipation.
Step-by-step explanation:
The question refers to the effects that certain drugs have on gastric motility, which is the contraction of the stomach muscles that mixes and propels contents in the gastrointestinal tract. Of the options provided, calcium channel blockers and opioids are known to affect gastric motility. Calcium channel blockers can relax smooth muscle, including those in the gastrointestinal tract, leading to decreased motility. Opioids reduce gastrointestinal motility by acting on the enteric nervous system, often causing constipation as a side effect. However, the third option is incomplete as it ends with 'para', which is not identifiable as a drug class or specific drug known to affect gastric motility.